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Role of the Glutamate Decarboxylase Acid Resistance System in the Survival of Listeria monocytogenes LO28 in Low pH Foods

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The glutamate decarboxylase (GAD) acid resistance system of the foodborne pathogen Listeria monocytogenes plays a major role in its survival at low pH. It was found that survival of the wild-type strain, LO28, in acidified reconstituted skim milk, diluted to reduce free glutamate levels, improves in response to supplementation with monosodium glutamate. A mutant, in which the two listerial GAD homologs have been deleted (and in which there is no discernible GAD activity), did not respond to glutamate supplementation and displayed greatly enhanced sensitivity in a number of low pH foods, even when levels of free glutamate were as low as 0.22 mM. We thus show that the GAD system plays a major role in the survival of L. monocytogenes in acidic foods even when levels of free glutamate are low.


Document Type: Research Article

Affiliations: 1: Department of Microbiology, University College Cork, Cork, Ireland 2: Department of Microbiology, and National Food Biotechnology Centre, University College Cork, Cork, Ireland

Publication date: September 1, 2001

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